Symbol

Parameter

Value

Unit

Ambient Operating Temperature

(2)

–40 to 85

°C

Storage Temperature Range

– 65 to 150

°C

Supply Voltage

– 0.3 to 6.5

V

Input/Output Voltage

V

Input Voltage

– 0.3 to 6.5

V

Electrostatic Discharge Voltage (Human Body model)

3000

V

Notes: 1. Except for the rating ”Operating Temperature Range”, stresses above those listed in the Table ”Absolute Maximum Ratings”

may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other

conditions above those indicated in the Operating sections of this specification is not i mplied. Exposure to Absolute Maximum

Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other

relevant quality documents.

2. Depends on range.

Mode

E

G

W

DQ0 - DQ7

Read

Data Out

Write

Data In

Standby / Write Inhibit

X

X

Hi-Z

Write Inhibit

X

X

Data Out or Hi-Z

Write Inhibit

X

X

Data Out or Hi-Z

Output Disable

X

X

Hi-Z

Table 3. Operating Modes

The circuit has been designed to offer a flexible

microcontroller interface featuring both hardware

and software handshakingmode with Ready/Busy,

Data Polling and Toggle Bit. The M28C16A/17A

supports 32 byte page write operation.

PIN DESCRITPION

Addresses (A0-A10). The address inputs select

an 8-bit memory location during a read or write

operation.

Chip Enable (E). The chip enable input must be

low to enable all read/write operations. When Chip

Enable is high, power consumption is reduced.

Output Enable (G). The Output Enable input con-

trols the data output buffers and is used to initiate

read operations.

Data In/ Out (DQ0 - DQ7). Data is written to or read

from the M28C16A/17A through the I/O pins.

Write Enable (W). The Write Enable input controls

the writing of data to the M28C16A/17A.

Ready/Busy (RB). Ready/Busy is an open drain

output that can be used to detect the end of the

internal write cycle. Ready/Busy is available for the

M28C17A in PDIP, PLCC and SO packages, and

for the M28C16A in TSOP only.

OPERATION

In order to prevent data corruption and inadvertent

write operations during power-up, a Power On

Reset (POR) circuit resets all internal programming

cicuitry. Access to the memory in write mode is

allowed after a power-up as specified in Table 7.

Read

The M28C16A/17Ais accessed like a static RAM.

When E and G are low with W high, the data

addressed is presented on the I/O pins. The I/O

pins are high impedancewhen either G or E is high.

DESCRIPTION (cont’d)

3/19

M28C16A, M28C17A